Apparatus for forming countersunk holes



May 3, 1932. L. E. POOLE 1,856,726

APPARATUS FOR FORMING COUNTERSUNK HOLES Filed Oct. 23, 1930 3 Sheets-Sheet l PUNCH May 3, 1932. L. E. POOLE APPARATUS FOR FORMING COUNTERSUNK HOLES Filed Oct. 25,- 1930 3 sheets-sheet 2 D 31:11 51:iitjiiiiiliii E y 1932. L; E. POOLE 1,856,726

APPARATUS FOR FORMING COUNT ERSUNK HOLES Filed Oct. 2z 1930 3 Sheets-Sheet 3 Patented May 3, 1932 sures;

PATENT I LORA a room, or mnnnsoiv, INDIAfiA; Assmnon TO D stco-nEnYconPoRA'jimn, or ANDERSON, INDIANA, A CORPORATION or DELAWARE ArrARArUs FOR romaine eonn'rnnsnmc Home Application filed bctober 23, 1930. Serial 4 550,614.

This invention relates to an apparatus for forming holes in relatively thick pieces of metal. Direct the objects of the present invention isto provide an apparatus which is simple and durable in construction and which will punch holes'in a bar of metal and then countersink the metal surrounding both ends of the hole. 7 V

Another object is providea'n apparatus adapted tobe attached to a conventional punch'p'ress for punching and countersink= ing holes in a bar of metal 7 Another object isto rdvide means ada t ed to be operated by the punch press for automatically feeding bars of metal to the punch and c'ountersinking device and for controlling the punch press so that the punch press will operate automatically when the V bars have been fed into the proper position.

Further objects and advantages of the present invention will'be apparentfrom the following description; reference being held to the accompanying drawing-e, wherein a preferred embodiment of one form of the present invention is clearly shovvh;

In the drawings Fig. l is a fragmentary s'ide'elevation of a punch press equipped with an apparatus embodying the present invention.

Fig. 2 is a sectional view on'th'e' line 2-'-2 of Fig. 1. v

Fi 3 is a diagrammatic view showingthe punch press clutch control.

Fig. 4 is a plan view of thep'un'ch and die members and magazine feeddetached from" the punch press. I

Fig; 5 is a sectional view on the line 5 -5 of Fig. 4. g v r Fig. 6 is a' plan view of the lower or stationary die members and is a view' taken sub stantially on the line 6-6 of Fig. 5.

Fig-711s an endview of the punch and die member and is partly'in sectiom'the section being on the line 7 of Fig. 6. I

20 designates the frame of the conventional punch press which supports a bedplate' 21 to which a base'frame 22 of the punch and die apparatus may be attached. The punch press supports a shaft 23 carrying an eccentric 24 operatively connected by an eccentric strap 25 with a vertical reciprocating cross head 26. The shaft 23 carries a large gear 27 driven by a small gear 28 mounted on a shaft 29 carrying a driving pulley 30 and a loose pulley 31. The driving connection between the gear 27 and the shaft 23 is controlled by any conventional punch press clutch of the type which automatically disconnects vthe clutch after one revolution. As this ty'pe of clutch is well known to those skilled in this art, a detail description of the same is considered unnecessary other than to state that the clutch is caused to connect the gear 27 with the shaft 23 when the clutch operating 3 rod 32 is pulled downwardly against the action of a return spring 33 located between bracket 34 and a stop collar 35, fixed to the rod 32. It will also be understood that if the rod 32 is released before the end of onererecess for receiving a lower die member 41 which cooperates with a punch 42 fixed to a punch block 43 confined in suitable recesses between block 44 and upper frame member 45 which is attached'to the punch press head 26.

The punch 42 is reenforced by a jacket 46 supported byblock 44 and having a conical downwardly projecting portion 47 adapted to'be'received, within aconical recess 48 in a cover plate 49 attached by screws 50 to the base frame 22. In this way the punc'h 42 is i provided with a lateral support extending as close as possible to theshearing end of the punch. Theblock 40 is removably secured to the base frame 22 by set screws 51.

The punch supported block 44 is secured to the upper frame 45 by screws 52. The cover plate 491s provided with a duct 53 to which a pipe may be attached for conducting alu'bria eating and cooling fluid to the punch The work pieces of bar B are maintained in a vdesired location with respect to the punch 42 ion and die 41 by three spring urged plungers 55 arranged in staggered relation, two being on one side and one on the other side and shown more clearly in Fig. 6.

The holechamfering or countersinking means comprises a pair of round bars or blocks 60 and 61 having conical ends 62 and 63 respectively adapted to be forced intothe material surrounding the ends of the hole which were punched in the bar B. The blocks 60 and 61 are suitably supported by the blocks 40 and 44 respectively. As the block 61 clescends to force the bar B against the block 62, the bar B is pushed against a stripped plate 63 urged upwardly by springs 64. Upward movement of the stripped plate 63 is arrested when the heads 65 of screws 66 attached to the plate 63 engage shoulders 67 provided by the base block 40. A plunger 70, having a round lower end and yieldably urged downwardly by a spring 71, serves as a stop tending to limit movement of the bar B from left toward right as viewed from Fig. 5. However, this plunger 70 yields to permit ejection of the bar B.

It will be noted that the lower or base frame 22 and the upper frame 44 support two sets of punch and die members and hole chamfering or countersinking members. Consequently there are provided two magazines each adapted to receive a stack of bars B. WVith each magazine there is associated a feeding bar 81 which moves the lowermost bar B of the stack in the magazine into the desired position under the punch press, first between the punch and die members and then between the countersinking blocks. The two bars 81 which feed the barsB from the magazine to the punch and die and countersinking blocks are attached to a yoke 82 connected with one end of a slide bar 83 having its other end connected by a pin 84 with an adjustable link 85 connected with a crank 86 operated by a shaft 87 driven by reduction gears enclosed by a. gear housing 88 and connected through shaft 89 with a motor 90 supported on a bracket 91 attached to the punch press frame 20. Rotation of the shaft 87 causes a feeding movement of the feeding bars 81 from left toward right and also a return movement of these bars so that the right hand ends clear the left ends of the bars B which are in the stacks in the magazine 80.

The shaft 87 carries a cam 92 which operates upon a lever connected by rod 94 with a bifurcated block 95 attached to the lower end of the clutch control rod 32. The cam 92 is located in such relation to the crank 86 that the punch press clutch will be caused to connect the gear 27 with the shaft 23 immediately after the feed bars 81 have been moved into the position shown in Fig. 5. During the reciprocation of the punch press head to move the punch 42 and the upper chamfering or countersinking block 61 downwardly into the position shown in Fig. 5 and then upwardly again, the crank 86 moves from the position shown in Fig. 2, 90 or toward the left so as to return the feed bars 81 to a position to the left of the tacks of work bars B.

The disclosed embodiment of the present invention is designed particularly to operate up'on pole pieces of dynamo electric machines. It was formerly the practice to first drill the countersink and finally tap holes in these pole pieces for the purpose of receiving screws by which the pole pieces are attached to the frame of the dynamo electric machine. The present invention dispenses with the use of rotating tools to perform the drilling and countersinking operation and substitutes afaster operating, more rugged and more simple device which can be operated by the conventional punch press. Therefore the present invention affords a considerable saving in time and maintenance and wear and tear incidental to the use of more expensive drilling machinery.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. Apparatus for forming countersunk 95 holes in pole pieces comprising, in combination, cooperating punch and die members for piercing holes in the work piece, cooperating countersinking blocks having conical portions adapted to enter opposite ends of the hole in the Work piece and to be forced against the material surrounding the hole, means for reciprocating the punch and one of the countersinking blocks, and means for feeding the work pieces successively through the apparatus.

2. Apparatus for forming countersunk holes inpole pieces comprising in combination, cooperating punch and die members for piercing holes in the Work piece, cooperating countersinking blocks having conical portions adapted to enter opposite ends of the hole in the work piece and to be forced against the material surrounding the hole, a punch press having a bed for supporting the 5 hole piercing die and one of the countersinking blocks and having a reciprocating cross head for moving the hole piercing punch and the other countersinking block,

a clutch for controllingthe punch press, means for feedingthe work pieces successively through the apparatus, and a mechanism for'controlling the-punch press clutch and for operating the feeding means.

3. Apparatus for forming countersunk, holes in pole pieces comprising in combination, cooperating punch and die members for piercing holes in the work piece, cooperat-. ing countersinking blocks having conical portions adapted to enter opposite ends of the hole in the Work piece and to be forced against the material surrounding the hole, a punch press having a bed for supporting the hole piercing die and one of the countersinking blocks and having a reciprocating cross head for moving the hole piercing punch and the other countersinking block, a clutch for controlling the punch press, means for feeding the Work pieces successively through the apparatus, means for controlling the punch press clutch and for operating the feeding means, and an individual driver for the last said means.

4. Apparatus for forming countersunk holes in pole pieces comprising in combination, cooperating punch and die members for piercing holes in the Work piece, cooperating countersinking blocks having conical portions adapted to enter opposite ends of the hole in the Work piece and to be forced against the material surrounding the hole, a punch press having a bed for supporting the hole piercing die and one of the countersinking blocks and have a reciprocating cross head for moving the hole piercing punch and the other countersinking blocks, a clutch for controlling the punch press, means for feeding the Work pieces successively through the apparatus, and the mechanism for controlling the punch press clutch and the feeding means.

In testimony whereof I hereto afiix my signature.

LORA E. POOLE. 

